若极板B稍向上移动一点,则将观察到静电计指针偏角
若极板B稍向左移动一点,则将观察到静电计指针偏角
(2)如图所示为示波管的示意图,以屏幕的中心为坐标原点,建立如图所示的直角坐标系xoy,当在这对电极上加上恒定的电压,同时在电极上加上恒定的电压时,荧光屏上光点的坐标为(4,-1),则当在这对电极上加上恒定的电压,同时在电极上加上恒定的电压时,荧光屏上光点的坐标为(
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2